diff --git a/module/VuFind/src/VuFind/Db/Table/User.php b/module/VuFind/src/VuFind/Db/Table/User.php
index 9978af7f188e7d1c2d43ce7b4f72cb4bc8c0f09f..46ddc32a9340acb3b9844499cb7f91f1c02089e3 100644
--- a/module/VuFind/src/VuFind/Db/Table/User.php
+++ b/module/VuFind/src/VuFind/Db/Table/User.php
@@ -50,7 +50,7 @@ class User extends Gateway
      *
      * @param \Zend\Config\Config $config VuFind configuration
      */
-    public function __construct(\Zend\Config\Config $config)
+    public function __construct(\Zend\Config\Config $config = null)
     {
         parent::__construct('user', 'VuFind\Db\Row\User');
         $this->config = $config;